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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '659c6994f779d6e86e45785b99045ae3f9e9e96369698c4c8910808944a4e1dd' 
  AND token = '9kPn/6mBIfsvkjAIj5yVEi2bHitMyWA1HJcSFkEVm+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}